Pluto

Pluto
February 18th, 1930 - August 24th, 2006

On the 24th of August in 2006 Pluto was demoted from "Planet"
to "Dwarf Planet" because of a re-definition of what a "Planet" is
by the IAU.
A planet has to pretty much fullfill 3 things (I've generalized these
quite a bit):

Its gotta be large enough so that its round.

Its gotta have a stable orbit around the sun.

Its gotta have its region of space cleared of any debris.

Pluto failed on the 3rd criteria. There is still a lot of asteroids
floating around out in that neck-of-the-woods. But hey, Pluto is out
there all alone, its small, and it takes longer for it to go around
the sun. So of course there is other debris! Hell, just a few billion
years ago earth would have failed on that point too!

Also, I don't think its fair that just _one_ planet decided on such
a matter for _all_ planets in the solar system.

But I do think that the IAU's method for determining planethood is
sound. Therefore, I think that Pluto should be Grandfathered in as
a planet.